Transcript for Search Intensifies for Suspect in Kansas City Highway Shootings

We begin in Kansas City, Missouri, where someone has been shooting at cars and drivers for several weeks. As Michelle Franzen reports this morning, the search for the gunman is intensifying. Reporter: This morning, police have stepped up the hunt for a possible serial shooter in Kansas City, Missouri. Linked, authorities say, to at least 13 random shootings, targeting drivers on highways. Federal investigators have joined the search. But so far, no suspects. Somebody's apprehended and will have resources out there. Reporter: The shoot iing dot areas of interstates, near exits and interchanges. Key clues that could help close in on the shooter. Each time it occurs, they get a little more information. A car description. A better description of the individual. He'll make a mistake, maybe. And somebody will get a tag number. Reporter: Police say three people have been injured by gunfire so far, with injuries to arms and legs. And take a look at the cars. Bullet holes show the damage. And close calls for drivers like Thomas. If something hit the car. Didn't know what it was. Pulled over my first opportunity. That's when I saw the bullet hole. Reporter: Drivers on-edge, knowing the shooter could strike again. It's scary to think that somebody is out here doing it with no regard for what can happen. Reporter: In addition to patrols, police are offering a $10,000 reward for information leading to an arrest. For "Good morning America," Michelle Franzen, ABC news, New York.

This transcript has been automatically generated and may not be 100% accurate.

FBI Joins Hunt For Gunman Targeting Drivers

Police say at least 20 cars have been shot on highways around Kansas City.

Highway Mystery: Drivers Warned After 13 Shootings in Kansas City.

Police say at least six of the recent shootings are connected; FBI looking for clues.

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